6 CHAPTER OUTLINE 6.1 Newton’s Second Law Applied to Uniform Circular Motion 6.2 Nonuniform Circular Motion 6.3 Motion in Accelerated Frames 6.4 Motion in the Presence of Resistive Forces 6.5 Numerical Modeling in Particle Dynamics Circular Motion and Other Applications of Newton’s Laws ANSWERS TO QUESTIONS Q6.1 Mud flies off a rapidly spinning tire because the resultant force is not sufficient to keep it moving in a circular path. In this case, the force that plays a major role is the adhesion between the mud and the tire. Q6.2 The spring will stretch. In order for the object to move in a circle, the force exerted on the object by the spring must have a size of mv r 2 . Newton’s third law says that the force exerted on the object by the spring has the same size as the force exerted by the object on the spring. It is the force exerted on the spring that causes the spring to stretch. Q6.3
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